/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: Administrator
 * Date: 2024-02-25
 * Time: 17:17
 */

/*
public class HelloWorld {
    //public class 修饰的类名一定要和文件名一致，并且有且只有一个。

    /*public static void main(String[] args) {
            System.out.println("hello world!");
            int a = 10;
            int b = 20;
            System.out.println(a + b);
            int ret = a + b;
            System.out.println(ret);
    }*/



  /* public static void main(String[] args) {
       System.out.println("hello");
       for (int i = 0; i < 10; i++) {
           System.out.println("abcd");
       }
        int a = 10_0000;
       System.out.println(a);
       System.err.println(a);
   }*/



    /*public static void main(String[] args) {

        int a = 10;
        a = 100;
        System.out.println(a);

        int b = 20;
        System.out.println(b);

        //Integer : int 的包装类，通俗来讲就是Int的plus版本
        System.out.println(Integer.MAX_VALUE);
        System.out.println(Integer.MIN_VALUE);

        Integer i = 100;
        System.out.println(i);

        byte c = 30;
        System.out.println(c);
    }*/



   /*public static void main(String[] args) {
        int a = 10;
        int b = 3;
        System.out.println(a / b);

        double num = 1.1;
        System.out.println(num * num);
    }*/



    /*public static void main(String[] args) {
        byte eg = 1;
        System.out.println(eg);
        System.out.println(Byte.MAX_VALUE);
        System.out.println(Byte.MIN_VALUE);
        System.out.println("========================");

        short a = 12;
        System.out.println(a);
        System.out.println(Short.MAX_VALUE);
        System.out.println(Short.MIN_VALUE);

        System.out.println("========================");

        int b = 2;
        System.out.println(b);
        System.out.println(Integer.MAX_VALUE);
        System.out.println(Integer.MAX_VALUE);
        System.out.println("========================");

        long c = 100L;
        System.out.println(c);
        System.out.println(Long.MAX_VALUE);
        System.out.println(Long.MIN_VALUE);
        System.out.println("========================");

        float d = 20.7f;
        System.out.println(d);
        System.out.println(Float.MAX_VALUE);
        System.out.println(Float.MIN_VALUE);
        System.out.println("========================");

        double e = 22.44;
        System.out.println(e);
        System.out.println(Double.MAX_VALUE);
        System.out.println(Double.MIN_VALUE);
    }*/



    /*public static void main(String[] args) {
        char ch = 'A';
        System.out.println(ch);
        char ch1 = '丁';
        System.out.println(ch1);
    }*/



    /*public static void main(String[] args) {
        boolean flag = true;
        System.out.println(flag);
    }*/



    /*public static void main(String[] args) {
        int a = 10;
        long b = 100L;
        b = a;
        a = (int)b;
    }*/



    /*public static void main(String[] args) {
        int a =  10;
        long b = 20;
        int c = (int) (a + b);
        long d = a + b;
        System.out.println(d);
    }*/



    /*public static void main(String[] args) {
        byte a = 124;
        byte b = 123;
        byte c = (byte) (a + b);
        System.out.println(c);
        int d = a + b;
        System.out.println(d);
    }*/



    /*public static void main(String[] args) {
        String str = "hello";
        System.out.println(str);

        int a = 10;
        String s1 = String.valueOf(a);
        System.out.println(s1);

        String S2 = a + "hello";
        System.out.println(S2);

        String s3 = 10 + 20 + "x";
        String s4 = "X" + 10 + 20;
        System.out.println(s3);
        System.out.println(s4);
    }*/



    /*public static void main(String[] args) {
        String str = "10081";
        int num = Integer.valueOf(str);
        System.out.println(str + 1);
        int ret = Integer.parseInt(str);
        System.out.println(str + 2);

    }*/



    /*public static void main(String[] args) {
        System.out.println(5 / 2);
        System.out.println((float)5 / 2);
        System.out.println(5 / (float)2);
        System.out.println((float)(5 / 2));

    }*/



    /*public static void main(String[] args) {
        System.out.println(10 % 3);
        System.out.println(10 % -3);
        System.out.println(-10 % 3);
        System.out.println(-10 % -3);
        System.out.println(11.5 % 2);
    }*/


    /*public static void main(String[] args) {
        int a = 10;
        a += 10;
        System.out.println(a);

        long b = 100;
        int c = 7;
        c = (int)(c + b);// 等价于c += b;
        System.out.println(c);
    }
*/



    /*public static void main(String[] args) {
        int a = 10;
        a++;
        System.out.println(a);

        int b = 12;
        ++b;
        System.out.println(b);

        int num = 10;
        int ret = num++;
        System.out.println(ret);
        System.out.println(num);

        int num2 = 20;
        int ret2 = ++num2;
        System.out.println(ret2);
        System.out.println(num2);
    }*/



    /*public static void main(String[] args) {
        int a = 19;
        int b = 20;
        System.out.println(a == b );
        System.out.println(a != b );
        System.out.println(a < b );
        System.out.println(a <= b );
        System.out.println(a > b );
        System.out.println(a >= b );
    }*/



    /*public static void main(String[] args) {
        int a = 1;
        int b = 2;

        System.out.println(a == 1 && b == 2);
        System.out.println(a == 1 && b > 100);
        System.out.println(a > 100 && b == 2);
        System.out.println(a > 100 && b > 100);
    }*/



    /*public static void main(String[] args) {
        int a = 1;
        int b = 2;

        System.out.println(a == 1 || b == 2);
        System.out.println(a == 1 || b > 100);
        System.out.println(a > 100 || b == 2);
        System.out.println(a > 100 || b > 100);
    }*/



    /*public static void main(String[] args) {
        int a = 1;
        System.out.println(!(a == 1));
        System.out.println(!(a == 2));
    }*/



    /*public static void main(String[] args) {
        System.out.println(10 > 20 && 10 /0 == 0);
        System.out.println(10 < 20 || 10 /0 == 0);
    }*/



    /*public static void main(String[] args) {
        int a = 10;
        int b = 20;
        int max = a > b ? a : b;
        System.out.println(max);
    }
} */

//块注释：ctrl + shift + /
//取消块注释：ctrl + shift + /
//行注释：ctrl + /
//取消行注释：ctrl + /
//文档注释：/**